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CVE-2026-47759 — Vulnerability in tinymce/tinymce — CVE Details

HIGH

TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes

Published June 5, 2026Updated September 10, 2026Source: osv

Summary

### Impact Stored XSS vulnerability via unsanitized data-mce-* attributes (data-mce-href, data-mce-src, data-mce-style). Allows attackers to inject malicious values that override safe attributes during serialization, bypassing validation. ### Patches Patched by stripping unsafe data-mce-* attributes during parsing. Users should upgrade to the latest patched versions (5 LTS, 7.x, 8.x). ### Workarounds No official workaround available. ### Fix To avoid this vulnerability: Upgrade to TinyMCE 8.5.1 or higher. Upgrade to TinyMCE 7.9.3 or higher. Upgrade to TinyMCE 5.11.1 LTS or higher for TinyMCE 5.x (only available as part of commercial [long-term support](https://www.tiny.cloud/long-term-support/) contract). ### Acknowledgements Tiny thanks [Tadi Kadango](https://github.com/mtrill47) ([website](https://tadiwakadango.com/)) and [Ivan Babenko](https://github.com/he1d3n) for their help identifying this vulnerability.

Advisory Timeline

  • First published June 5, 2026 (129 days ago).
  • Last revised September 10, 2026 — 96 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet
Update TinyMCE to 7.9.3 or later
dotnet add package TinyMCE --version 7.9.3
Composer
Update tinymce/tinymce to 7.9.3 or later
composer require "tinymce/tinymce:^7.9.3"
Composer
Update tinymce/tinymce to 8.5.1 or later
composer require "tinymce/tinymce:^8.5.1"
npm
Update tinymce to 7.9.3 or later
npm install tinymce@7.9.3
npm
Update tinymce to 8.5.1 or later
npm install tinymce@8.5.1
NuGet
Update TinyMCE to 8.5.1 or later
dotnet add package TinyMCE --version 8.5.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (9)

Affects 3 ecosystems: npm (1), nuget (1), packagist (1).

PackageEcosystemAffectedFixed In
tinymce/tinymce
packagist
4.0.0, 4.0.1, 4.0.10, 4.0.11 (+169 more)Range-based data available
TinyMCE
nuget
6.0.0, 6.0.1, 6.0.2, 6.0.3 (+45 more)7.9.3
tinymce/tinymce
packagist
6.0.0, 6.0.1, 6.0.2, 6.0.3 (+47 more)7.9.3
tinymce/tinymce
packagist
8.0.0, 8.0.1, 8.0.2, 8.1.0 (+10 more)8.5.1
tinymce
npm
All versions7.9.3
tinymce
npm
All versions8.5.1
TinyMCE
nuget
3.4.3.2, 3.4.4, 3.4.5, 3.4.7 (+178 more)Range-based data available
TinyMCE
nuget
8.0.0, 8.0.1, 8.0.2, 8.1.0 (+10 more)8.5.1
tinymce
npm
All versionsRange-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.7 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-47759?
TinyMCE Cross-Site Scripting (XSS) vulnerability using through data-mce- prefixed src, href, style attributes This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.7/10).
How do I check if my project is affected by CVE-2026-47759?
CVE-2026-47759 affects tinymce/tinymce, TinyMCE and tinymce. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-47759 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.7

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-q742-qvgc-gc2f

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